Since 1867, this nonprofit professional service organization has worked to enhance the practice of architecture and the public and professional understanding of design. Affiliate members include engineers, contractors, owners/clients, public officials, other allied professionals, students, and others interested in design and the built environment. Visit BSA's Web site for upcoming events and educational opportunities, publications, membership information, and a directory of current affiliate members.

The BSA has sister chapters in Central Massachusetts and Western Massachusetts. The three chapters make up the Massachusetts chapter of the American Institute of Architects.